Originally Posted by Zurgat
There seem to be some exceptions however, the "Ethereal Thieves" in Karazhan hit you with a disarm debuff that (even if you're immune to disarm) still drops your threat.
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That's actually a different mechanic. While Druids suffer no downside from getting disarmed, they are not immune to the effect: Disarm affects them, it's just utterly useless.
If you're truly disarm immune (By using a Weapon Chain, one of those Gloves that make you disarm immune, by being an Arms Warrior or simply by not having a weapon equipped) the Ethereal Thieves will instead Disarm the next person in melee range with highest threat.
I'm unsure whether their disarm can be parried or dodged; most other Disarms can be, but I haven't really had opportunity to test it recently as those are the only disarming mobs I can think of facing recently, and I simply unequip my weapon when tanking them to avoid the aggro reduction. Presumably I face disarming mobs more frequently, but it doesn't really make a difference for a Paladin with maxed out Unarmed skill to get disarmed, so I rarely notice it happening.
Anyway, less waffling about disarm, and more on the subject, there's a fair amount of different mechanics for threat clears. Most knockbacks appear to work on the "This will only reduce your threat if it actually hits you." mechanic, but something like the Ice Tomb used by Skeletal Ushers seems to work with more of a "It doesn't matter if it hits you, say goodbye to your threat." mechanic.